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Having problems with your Dell Dimension 4550 PC Desktop ?

My dell 4550 just keep going to the welcome screem and back if i try start in safe mode it keeps coming back their.the light on the back A,B,C r in green while D is in yellow can u tell me what my promple is.......THANkS

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My dell 4550 just keep going to the welcome screem and back if i try start in safe mode it keeps coming back their.the light on the back A,B,C r in green while D is in yellow can u tell me what my promple is.......THANkS

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